Otto Mueller) and works by other representatives of Classical Modernism (Marc Chagall, Otto Dix). The second integral part of the museum is the Sammlung Ludwig, a collection of art by Picasso, Russian avant-garde and American Pop-art artists. With around 900 works by Picasso, the museum today has the third largest collection of this artist worldwide, after Barcelona and Paris. In addition, Peter Ludwig and his wife Irene later put their collection of the Russian avant-garde on permanent loan to the museum, including 600 works from the period 1905 to 1935 by artists such as Kasimir Malevich, Ljubov Popova, Natalia Goncharova, Mikhail Larionov, and Alexander Rodchenko. Today the museum houses the most comprehensive collection of early Russian avant-garde artworks outside Russia. Works Selected works of the collection Pierre Alechinsky : Coupe sombre (1968). Josef Albers : Green Scent (1963). Peter Blake : ABC Minors (1955), Bo Diddley (1963). Salvador Dalí : La Gare de Perpignan (1965). Otto Dix : Bildnis des Dr. Hans Koch (1921), Vorstadtszene (1922), Mädchen mit rosa Bluse (1923), Bildnis Frau Dr. Koch (1923). Richard Estes : Food Shop / Snack-bar (1967). Natalia Goncharova : Nature morte à la peau de tigre (1908), Portrait de Larionov (1913), Vendeuse d'oranges (1916). Duane Hanson : Woman with a Purse / Femme au sac en bandoulière (1974). Jasper Johns : Untitled (1972). Allen Jones : Figure Falling / Chute (1964), Perfect Match / Partenaire idéale (1966–1967). Edward Kienholz : Night of Nights / Nuit des nuits (1961), The Portable War Memorial / Monuments aux morts portable (1968). Roy Lichtenstein : Takka-Takka (1962), Mad Scientist / Le savant fou (1963), M-Maybe / P-Peut-être (1965), Explosion n° 1 (1965), Study for Preparedness / Étude pour Disponibilité (1968) László Moholy-Nagy : Grau-Schwarz-Blau / Gris-Noir-Bleu (1920), Auf weissen Grund / Sur fond blanc (1923). Kenneth Noland : Provence (1960), Shadow Line / Ligne d'ombre (1967). Claes Oldenburg : The Street / La rue (1960), Success Plant / Félicitations pour l'avancement (1961), White Shirt with Blue Tie / Chemise blanche et cravate bleue (1961), Green Legs with Shoes / Jambes vertes avec chaussures (1961) Eduardo Paolozzi : The Last of the Idols (1963). Robert Rauschenberg : Odalisque (1955–1958), Allegory / Allégorie (1959–1960), Wall Street (1961), Black Market / Marché noir (1961), Axle / Axe (1964), Bible Bike (Borealis) (1991). Gerhard Richter : Ema (Akt auf einer Treppe) / Ema (Nude on a Staircase) (1966), 48 Porträts