A large building roofed

Ascending and Descending is a lithograph print by the Dutch artist M. C. Escher first printed in March 1960. The original print measures 14 in × 11+1⁄4 in. The lithograph depicts a large building roofed by a never-ending staircase. Two lines of identically dressed men appear on the staircase, one line ascending while the other descends. Two figures sit apart from the people on the endless staircase: one in a secluded courtyard, the other on a lower set of stairs. While most two-dimensional artists use relative proportions to create an illusion of depth, Escher here and elsewhere uses conflicting proportions to create the visual paradox.

The Citadel of Dinant is a fortress located in the Walloon city of Dinant in the province of Namur, Belgium. The current fort was built in 1815 on a site which was originally fortified in 1051 when the region was ruled by the Prince-Bishopric of Liège. The citadel overlooks the city of Dinant and the strategic Meuse river which runs through the town. It is open to the public. Together with those at Huy, Liège and Namur, the Citadel of Dinant forms part of the so-called Meuse Citadels.

Aphysoneura pigmentaria, the painted ringlet, bamboo painted ringlet or bamboo ringlet, is a butterfly in the family Nymphalidae. It is found in the DRC, Uganda, Kenya, Tanzania, Malawi, Zambia and Zimbabwe. The habitat consists of the bamboo zone of montane forests.