• Interactive floor upstairs: the "Through Escher's Eyes" rooms on the second floor are the hands-on part, with tessellations and impossible figures to play with
• Museumkaart not accepted, though Ooievaarspas, Holland Pass and Rotterdampas are valid, and an online ticket works any day for a year
• Leave the stroller behind: the cloakroom has no space for pushchairs, and the listed building has steps at the entrance (a small lift serves the rooms)

More than 120 prints by M.C. Escher hang in the former winter palace of Queen Emma on Lange Voorhout, from Day and Night to the seven-meter Metamorphosis III.

Kids get the most from the second floor, "Through Escher's Eyes": they turn giant or tiny in a few seconds, make their own tessellation, play with impossible figures and walk an Op-art room where the artworks seem to move.