form constants
...that the same visual hallucinations of geometric patterns, known as form constants, are seen in near-death experiences, synesthesia, and drug-enduced hallucinatory visions?
...that the same <a href="./Hallucination" id="mwBg4" rel="mw:WikiLink" title="Hallucination">visual hallucinations</a> of <a class="mw-redirect" href="./Geometric_pattern" id="mwBg8" rel="mw:WikiLink" title="Geometric pattern">geometric patterns</a>, known as <b id="mwBhA"><a href="./Form_constant" id="mwBhE" rel="mw:WikiLink" title="Form constant">form constants</a></b>, are seen in <a href="./Near-death_experience" id="mwBhI" rel="mw:WikiLink" title="Near-death experience">near-death experiences</a>, <a href="./Synesthesia" id="mwBhM" rel="mw:WikiLink" title="Synesthesia">synesthesia</a>, and drug-enduced <a href="./Hallucination" id="mwBhQ" rel="mw:WikiLink" title="Hallucination">hallucinatory</a> visions?