▁colours . ▁ ▁In ▁both ▁the ▁Cleveland ▁and ▁C inc inn ati ▁impress ions ▁of ▁the ▁Knight ▁and ▁Hal ber d ier ▁there ▁are ▁black ▁line ▁blocks ▁and ▁a ▁" gre y ish - blue " ▁tone ▁block ; ▁other ▁tone ▁blocks ▁are ▁described ▁as ▁" blue - gre y " ▁( Or phe us ▁and ▁the ▁Sk ull ) ▁and ▁" gre y - green " ▁( Py ram us ▁and ▁This be ). ▁▁▁▁ ▁His ▁mon ogram , ▁used ▁only ▁on ▁eleven ▁of ▁his ▁ch iar osc uro ▁prints , ▁consists ▁in ▁its ▁full est ▁form ▁of ▁his ▁initial s ▁" I o ▁V " ▁ ▁between ▁two ▁diag on ally ▁crossed ▁pil gr im ' s ▁st aves , ▁with ▁a ▁flower ▁in ▁the ▁centre , ▁on ▁a ▁cart ell ino ▁or ▁pla que , ▁a ▁style ▁copied ▁from ▁Al bre cht ▁D ür er . ▁ ▁His ▁prints , ▁recogn ised ▁as ▁a ▁group , ▁ ▁remained ▁un att ributed ▁to ▁any ▁documented ▁artist ▁until ▁ 1 8 5 1 , ▁when ▁his ▁name ▁on ▁the ▁title ▁page ▁of ▁a ▁book ▁he ▁illustrated ▁was ▁connected ▁with ▁the ▁mon ogram ▁and ▁the ▁few ▁document ary ▁records . ▁ ▁A ▁similar ▁mon ogram ▁was ▁used ▁by ▁the ▁glass - p ain ter ▁Jacob ▁We cht lin , ▁perhaps ▁a ▁brother . ▁ ▁Book ▁illustr ations ▁His ▁best ▁known ▁book ▁illustr ations ▁in ▁his ▁own ▁time ▁were ▁ 1 3 5 ▁wood cut s ▁from ▁Sebastian ▁Br ant ' s ▁▁ 1