Anicca (continuous change, impermanence), dukkha (suffering), Anatta (egolessness) — are the three essential characteristics of things in the teaching of the Buddha. If you experience anicca correctly, by practice of Vipassana, you will know dukkha as its corollary and anatta as ultimate truth. It takes time to understand the three together.
(ii) by contact of sound with the sense organ of the ear;
(iii) by contact of smell with the sense organ of the nose;
(iv) by contact of taste with the sense organ of the tongue;
(v) by contact of touch with the sense organ of the body;
(vi) and by contact of mental objects such as thoughts, emotions, memories etc, with the sense organ of the mind.